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Summary of Investments (Investments in Unrealized Loss Position) (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
issue
Dec. 31, 2019
USD ($)
issue
Number of Issues    
Less than 12 months | issue 44 24
12 months or longer | issue 11 27
Fair Value    
Less than 12 months $ 97,470 $ 107,540
12 months or longer 937 20,230
Total 98,407 127,770
Gross Unrealized Depreciation    
Less than 12 months 2,539 557
12 months or longer 7 235
Total $ 2,546 $ 792
U.S. Treasury    
Number of Issues    
Less than 12 months | issue   0
12 months or longer | issue   2
Fair Value    
Less than 12 months   $ 0
12 months or longer   4,733
Total   4,733
Gross Unrealized Depreciation    
Less than 12 months   0
12 months or longer   12
Total   $ 12
U.S. government agency    
Number of Issues    
Less than 12 months | issue   3
12 months or longer | issue   0
Fair Value    
Less than 12 months   $ 13,846
12 months or longer   0
Total   13,846
Gross Unrealized Depreciation    
Less than 12 months   104
12 months or longer   0
Total   $ 104
Foreign bonds    
Number of Issues    
Less than 12 months | issue 1  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 597  
12 months or longer 0  
Total 597  
Gross Unrealized Depreciation    
Less than 12 months 2  
12 months or longer 0  
Total $ 2  
Public utilities    
Number of Issues    
Less than 12 months | issue 8  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 20,882  
12 months or longer 0  
Total 20,882  
Gross Unrealized Depreciation    
Less than 12 months 424  
12 months or longer 0  
Total $ 424  
Mortgage-backed securities    
Number of Issues    
Less than 12 months | issue 0 0
12 months or longer | issue 8 13
Fair Value    
Less than 12 months $ 0 $ 0
12 months or longer 279 1,585
Total 279 1,585
Gross Unrealized Depreciation    
Less than 12 months 0 0
12 months or longer 4 21
Total $ 4 $ 21
Collateralized mortgage obligations | Government national mortgage association    
Number of Issues    
Less than 12 months | issue 1 2
12 months or longer | issue 2 5
Fair Value    
Less than 12 months $ 1,525 $ 8,444
12 months or longer 542 3,053
Total 2,067 11,497
Gross Unrealized Depreciation    
Less than 12 months 28 38
12 months or longer 2 59
Total $ 30 $ 97
Collateralized mortgage obligations | Federal home loan mortgage corporation    
Number of Issues    
Less than 12 months | issue 2 12
12 months or longer | issue 1 3
Fair Value    
Less than 12 months $ 2,237 $ 50,829
12 months or longer 116 4,844
Total 2,353 55,673
Gross Unrealized Depreciation    
Less than 12 months 6 183
12 months or longer 1 37
Total $ 7 $ 220
Collateralized mortgage obligations | Federal national mortgage association    
Number of Issues    
Less than 12 months | issue 1 4
12 months or longer | issue 0 3
Fair Value    
Less than 12 months $ 2,337 $ 23,515
12 months or longer 0 1,102
Total 2,337 24,617
Gross Unrealized Depreciation    
Less than 12 months 26 90
12 months or longer 0 18
Total $ 26 $ 108
Energy | Corporate bonds    
Number of Issues    
Less than 12 months | issue 6  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 12,042  
12 months or longer 0  
Total 12,042  
Gross Unrealized Depreciation    
Less than 12 months 980  
12 months or longer 0  
Total $ 980  
Industrials | Corporate bonds    
Number of Issues    
Less than 12 months | issue 5  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 13,052  
12 months or longer 0  
Total 13,052  
Gross Unrealized Depreciation    
Less than 12 months 380  
12 months or longer 0  
Total $ 380  
Consumer goods and services | Corporate bonds    
Number of Issues    
Less than 12 months | issue 7  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 11,765  
12 months or longer 0  
Total 11,765  
Gross Unrealized Depreciation    
Less than 12 months 263  
12 months or longer 0  
Total $ 263  
Technology, media and telecommunications | Corporate bonds    
Number of Issues    
Less than 12 months | issue 3  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 6,919  
12 months or longer 0  
Total 6,919  
Gross Unrealized Depreciation    
Less than 12 months 166  
12 months or longer 0  
Total $ 166  
Financial services | Corporate bonds    
Number of Issues    
Less than 12 months | issue 8 3
12 months or longer | issue 0 1
Fair Value    
Less than 12 months $ 20,728 $ 10,906
12 months or longer 0 4,913
Total 20,728 15,819
Gross Unrealized Depreciation    
Less than 12 months 216 142
12 months or longer 0 88
Total $ 216 $ 230
South | Special revenue - south | States, municipalities and political subdivisions    
Number of Issues    
Less than 12 months | issue 2  
12 months or longer | issue 0  
Fair Value    
Less than 12 months $ 5,386  
12 months or longer 0  
Total 5,386  
Gross Unrealized Depreciation    
Less than 12 months 48  
12 months or longer 0  
Total $ 48